Thanks everybody, to Daniel Eckl> Thank you for consideration. I know the FQS to use Cyrus-IMAPD on NFS. But... historical details, I need to use and it looks work without problem...^_^; Then... From: Wesley Craig <wes@xxxxxxxxx> Subject: Re: How to backup cyrus-imapd without stopping service Date: Fri, 23 Jun 2006 10:31:03 -0400 Message-ID: <400EB816-06AB-437F-9702-ABD874DBC4FC@xxxxxxxxx> > On 22 Jun 2006, at 23:53, Daniel O'Connor wrote: > > On Friday 23 June 2006 12:17, Seiichirou Hiraoka wrote: > >> So I want to know the better (or recommend) way to backup > >> Cyrus-IMAPD /var/imap files to other host without stop > >> service. > > > > AFAIK the only way to do it properly is to use snapshots on the > > file system, > > and then use rsync or tar or whatever. If you use rsync the > > database will be > > inconsistent with itself or other files. > > If you're concerned that the databases files be consistent, then the > only way is to cleanly shutdown the processes that have the databases > open. Snapshots will definitely NOT guarantee consistency of the > databases, since consistent database updates can take multiple > writes. Take for example the recent discussion of database > corruption during sudden power lose. Snapshots stop user process > file access very suddenly, not cleanly. Problems created by > snapshots can usually be corrected with reconstruct. How about to use rsync and reconstruct (on backup) without using snapshot? > The real question is, what are your backups for? If you're concerned > about recovering mail that the user has deleted, then rsync-ing the > live system is fine. If you want a consistent copy that you could > switch to in the event of a large-scale disaster, then you probably > want to explore application-level replication. I want to switch main to backup host when main host is in trouble (i.e. Fatal Hardware Error). So I want to backup Cyrus-IMAPD DBs (/var/imap) and keep it consistent. Best regards, - flathill ---- Cyrus Home Page: http://asg.web.cmu.edu/cyrus Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
